The valve trim primarily consists of which two components?

The valve trim refers specifically to the internal components of a valve that control the flow of fluid through it. The primary components of the valve trim are the disc and the seat. The disc is the part that moves to open or close the valve, effectively controlling the flow by either covering or uncovering the seat. The seat is typically a fixed surface that the disc seals against when the valve is closed, preventing fluid from passing through.

This pairing of disc and seat is critical as it not only defines the flow characteristics of the valve but also determines how effectively the valve can shut off and provide a tight seal to prevent leakage. Other components, such as the body, cover, handle, stem, spring, and actuator, serve important roles in the overall functioning of the valve, but they do not define the trim itself. The trim specifically relates to the parts that directly interact with the fluid flow, making the disc and seat the correct answer for this question.